Add a trim

Author: directhex

src/mono/mono.proj

@@ -465,7 +465,7 @@
     <ItemGroup>
       <MonoAOTCMakeArgs Include="-DAOT_TARGET_TRIPLE=$(MonoAotAbi)"/>
       <MonoAOTCMakeArgs Condition="'$(_MonoUseNinja)' == 'true'" Include="-G Ninja"/>
-      <MonoAOTCMakeArgs Include="-DCMAKE_INSTALL_PREFIX=$([MSBuild]::NormalizeDirectory('$(MonoObjDir)', 'cross', 'out'))"/>
+      <MonoAOTCMakeArgs Include="-DCMAKE_INSTALL_PREFIX=$([MSBuild]::NormalizeDirectory('$(MonoObjDir)', 'cross', 'out').TrimEnd('\/'))"/>
       <MonoAOTCMakeArgs Include="-DCMAKE_BUILD_TYPE=$(Configuration)"/>
       <!-- FIXME: Disable more -->
       <MonoAOTCMakeArgs Include="-DENABLE_MINIMAL=com,remoting" />